function leftmenu(showHideDiv) {
var menu_leght = 6;
       for(var i=1; i<= menu_leght; i++) { 
	   var submenu = document.getElementById('submenu' + i);
               if (i == showHideDiv) {
                       submenu.style.display = 'block';
               }
               else {
                       submenu.style.display = 'none';
               }
       }
}